perl[8], cers[7], pers[7], reps[7], lern[5], rens[4],
cer[6], per[6], rep[6], ces[6], sec[6], pes[6], les[4], ern[3], ren[3], sen[3], ers[3], res[3],
ne[2], er[2], re[2], es[2],
